Percent Yield Calculator
Percent yield from actual and theoretical product mass.
Enter your values
ⓘ Live results
Results
- Percent yield
- 78.1%
- Actual yield
- 8.2 g
- Theoretical yield
- 10.5 g
Quick answer
Percent yield = (actual yield / theoretical yield) x 100%.
%yield = actual/theoretical x 100
How to use the Percent Yield Calculator
- 1Enter the actual mass of product recovered from the reaction.
- 2Enter the theoretical yield calculated from stoichiometry.
- 3Read the percent yield achieved.
Worked example
Using the values the calculator loads with:
Inputs
- Actual yield8.2 g
- Theoretical yield10.5 g
Results
- Percent yield78.1%
- Actual yield8.2 g
- Theoretical yield10.5 g
Frequently asked questions
Why is percent yield rarely 100%?
Side reactions, incomplete reactions and losses during purification all reduce actual yield below theoretical.
Can percent yield exceed 100%?
Only due to impurities or leftover solvent in the product — it indicates a measurement or purity problem.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.